Prediction of voltage and current propagation in twisted wire pairs (TWPs) by a circuit model

The performances of a twisted wire pairs (TWP) cable above ground are analysed in order to predict the internal propagation. To take into account the nonuniformity produced by the twists, the TWP line is discretized into sections of parallel wire transmission line (TL) whose different electrical parameters are derived analysing the different TWP cross-sections by the finite element method (FEM). The different TWP sections are then connected in a series cascade and the resulting configuration is analysed by a CAD circuit simulator. A comparison of the results obtained in the frequency range 40 MHz - 1 GHz by the proposed model with measurements is presented